Relay protection testing device

Abstract

The invention discloses a relay protection testing device applied to an electronic current transformer and a protection device therefor. The relay protection testing device comprises a frequency converter, a small signal generator, a signal monitor, a change over switch and aviation plugs, wherein an input end of the frequency converter is connected with an alternating current power source, an output end of the frequency converter is connected with an input end of the small signal generator, an output end of the small signal generator is connected with an input end of the signal monitor, an output end of the signal monitor is connected with an input end of the change over switch, and an output end of the change over switch is used for outputting small analog signals to the electronic current transformer or an electronic current transformer protection device via the aviation plugs. In the relay protection testing device, the small signal generator is used for directly generating the small analog signals that are high in precision, magnitude of small analog signal values can be randomly adjusted as needed, the aviation plugs corresponding to the electronic CT and the protection device for the same are used for transmitting and detecting the small analog signals, and the electronic CT and the protection device for the same can be verified conveniently.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a relay protection testing device. Background technique [0002] In the prior art, electronic current transformers (CTs) are generally used in early digital substations, and small analog signals are transmitted between electronic CTs and protection devices, which are different from analog signals of traditional CTs and different from photoelectric CTs. The optical signals are different, and because the device interface is not universal, the devices that can output small analog signals on the market cannot be used directly. Therefore, the field staff lacks suitable calibration methods for the calibration of electronic CT and the calibration of corresponding protection devices. This is not only unfavorable to the maintenance work, but also poses a great safety hazard to the normal operation of the power grid. [0003] Therefore, how to provide a relay protection testing ...

AI Technical Summary

Problems solved by technology

[0002] In the prior art, electronic current transformers (CTs) are generally used in early digital substations, and small analog signals are transmitted between electronic CTs and protection devices, which are different from analog signals of traditional CTs and different from photoelectric CTs. The optical signals are different, and because the device interface is not universal, the devices that can output small analog signals on the market cannot be used directly. Therefore, the field staff lacks suitable calibration methods for the calibration of electronic CT and the calibration of corresponding protection devices. inspection device, which is not only not conducive to the maintenance work, but also poses a great safety hazard to the normal operation of the power grid.

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